Vinyl Liner questions

On a recent liner replacement I noticed that the aluminum coping has some severe pitting and it looks as if the paint is deteriorating or appears to be dissolving . Has any one else heard of a problem like this or have a solution. Also on the same pool behind the liner there is a black stain that can be wiped off. I think its black mold but in my 25 years of building I have never run across this before. Any suggestions would be greatly appreciated. Chuck

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